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This paper was written over a time period in which the author had partial support from the National Science Foundation, both as a Senior Post-Doctoral Fellow and from N. S. F. Grant 8236, from the John Simon Guggenheim Memorial Foundation, and during the present year from the Sloan Foundation.
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Browder, F.E. On the spectral theory of elliptic differential operators. I. Math. Ann. 142, 22–130 (1961). https://doi.org/10.1007/BF01343363
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DOI: https://doi.org/10.1007/BF01343363